E0C5250
● Crystal Oscillation Characteristics
(Unless otherwise noted: VDD=2.7V to 5.5V, VSS=0V, C
G
=CD=18pF, Ta=25°C)
Parameter
Oscillation start time
Symbol
sta
Condition Min.
Typ.
Max. Unit
20 msec
t
3.579545MHz oscillator
● FSK Demodulation Circuit Characteristics
FSK AC characteristics
(Unless otherwise noted: VDD=5.0/3.0V, VSS=0V, fCLK=3.579545MHz, Ta=-20 to 70°C)
Parameter
Symbol
Condition
Min.
1188
1188
2178
1280
2068
20
Typ.
1200
1200
2200
1300
2100
–
Max. Unit
1212 Baud
1212 Hz
2222 Hz
1320 Hz
2132 Hz
Transfer rate
T
RATE
Bell 202 mark (logic 1) frequency
Bell 202 space (logic 0) frequency
ITU-T V.23 mark (logic 1) frequency
ITU-T V.23 space (logic 0) frequency
SN ratio
f
f
f
f
B1
B0
V1
V2
–
dB
SNR
CDONFSK
1
Carrier-detect ON sensitivity
(input level at TPI/RING)
V
DD=5V
Input amp gain (GAMP)=-5dB
DD=3V
Input amp gain (GAMP)=-9.4dB
DD=5V
Input amp gain (GAMP)=-5dB
DD=3V
Input amp gain (GAMP)=-9.4dB
-44.9 -42.9 -40.9 dBm
-47.1 -45.1 -43.1 dBV
-44.9 -42.9 -40.9 dBm
-47.1 -45.1 -43.1 dBV
-46.9 -44.9 -42.9 dBm
-49.1 -47.1 -45.1 dBV
-46.9 -44.9 -42.9 dBm
-49.1 -47.1 -45.1 dBV
V
1
Carrier-detect OFFsensitivity
V
CDOFFFSK
V
1:When the gain in the input amp is set to GAMP (dB), the CDONFSK and CDOFFFSK values (Typ.) can be calculated from the equation
below.
V
V
CDONFSK [dBm] = -GAMP - 47.9 + 20log( DD) [dBm], CDONFSK [dBV] = -GAMP - 50.1 + 20log( DD) [dBV]
5
5
CDOFFFSK [dBm] = -GAMP - 49.9 + 20log( DD) [dBm], CDOFFFSK [dBV] = -GAMP - 52.1 + 20log( DD) [dBV]
V
5
V
5
FSK switching characteristics
(Unless otherwise noted: VDD=5.0/3.0V, VSS=0V, fCLK=3.579545MHz, Ta=-20 to 70°C, CL=50pF)
Parameter
PDWN fall → FSK
Carrier detect start time
Data end → #DET rise
PDWN rise → Oscillation start
Symbol
Condition
Min.
Typ.
Max. Unit
20 msec
15 msec
15 msec
12 msec
15 msec
t
t
t
t
SUPD
CDON
CDOFF
DOCH
5
5
10
10
7
V
V
DD=5V
DD=3V
10
1st RING
2nd RING
Input
#RDRC
#RDET
PDWN
#DET
101010... 1 DATA
V
V
IH2
IL2
t
SUPD
t
CDON
t
CDOFF
SDO
101010... 1 DATA
t
DOCH
OSC4
5
SEIKO [ SEIKO EPSON CORPORATION ]
